/**
 * CrashExceptionHandler.java [V 1.0.0]
 * classes :com.xlab.basecomm.CrashExceptionHandler
 * allow.xuweibin Create in  2015年1月21日 下午3:28:00
 */
package com.dragon.utilslibrary.crashhandler;

/**
 * com.xlab.basecomm.CrashExceptionHandler
 *
 * @author allow.xuweibin <br/>
 * create in 2015年1月21日 下午3:28:00
 */

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.util.Log;

import com.dragon.utilslibrary.tools.FileUtils;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;


/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.  
 * 需要在Application中注册，为了要在程序启动器就监控整个程序。 
 */
public class CrashExceptionHandler implements UncaughtExceptionHandler {

    public static final String TAG = "CrashExceptionHandler";

    //系统默认的UncaughtException处理类       
    private UncaughtExceptionHandler mDefaultHandler;
    //CrashHandler实例      
    private static CrashExceptionHandler instance;
    //程序的Context对象
    private Context mContext;
    //用来存储设备信息和异常信息      
    private Map<String, String> infos = new HashMap<String, String>();

    //用于格式化日期,作为日志文件名的一部分      
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss", Locale.US);

    /** 保证只有一个CrashHandler实例 */
    private CrashExceptionHandler() {
    }

    /** 获取CrashHandler实例 ,单例模式 */
    public static CrashExceptionHandler getInstance() {
        if (instance == null)
            instance = new CrashExceptionHandler();
        return instance;
    }

    /**
     * 初始化   
     */
    public void init(Context context) {
        mContext = context;
        //获取系统默认的UncaughtException处理器      
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //设置该CrashHandler为程序的默认处理器      
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理   
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
//                CustomeToast.createToastConfig().showToast(mContext, mContext.getString(R.string.app_erro_exit)  , 2000);
                Looper.loop();
            }
        }.start();
        if (!handleException(ex) && mDefaultHandler != null) {
            //如果用户没有处理则让系统默认的异常处理器来处理      
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            try {
                Thread.sleep(250);
            } catch (InterruptedException e) {
                Log.e(TAG, "error : ", e);
            }
            //退出程序      
            android.os.Process.killProcess(android.os.Process.myPid());
            System.exit(1);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.   
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.   
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        ex.printStackTrace();
        //收集设备参数信息       
        collectDeviceInfo(mContext);

        //保存日志文件       
        saveCatchInfo2File(ex);
        return true;
    }

    /**
     * 收集设备参数信息   
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
                Log.d(TAG, field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中   
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCatchInfo2File(Throwable ex) {
        String reportMsg = convertThrowableToString(ex);
        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = "app-crash-" + time + "-" + timestamp + ".txt";
            saveMsgToFile(reportMsg, FileUtils.getAPPLogFilePath(fileName));
            sendCrashLog2PM(FileUtils.getAPPLogFilePath(fileName));
            return fileName;
        } catch (Exception e) {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }

    private String convertThrowableToString(Throwable ex) {
        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        return sb.toString();
    }

    /**
     * 将日志保存到手机本地
     * @param msg
     * @param path
     * @throws IOException
     */
    private void saveMsgToFile(String msg, String path) throws IOException {
        if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
            FileOutputStream fos = new FileOutputStream(path);//path+fileName);
            fos.write(msg.getBytes());
            fos.close();
        }
    }

    /**
     * 将捕获的导致崩溃的错误信息发送给开发人员 
     *
     * 目前只将log日志保存在sdcard 和输出到LogCat中，并未发送给后台。 
     */
    private void sendCrashLog2PM(String fileName) {
        if (!new File(fileName).exists()) {
//            Toast.makeText(mContext, "日志文件不存在！", Toast.LENGTH_SHORT).show();   
//            CustomeToast.createToastConfig().showToast(mContext, R.string.app_erro_nolog);
            return;
        }
        FileInputStream fis = null;
        BufferedReader reader = null;
        String s = null;
        try {
            fis = new FileInputStream(fileName);
            reader = new BufferedReader(new InputStreamReader(fis, "UTF-8"));
            while (true) {
                s = reader.readLine();
                if (s == null) break;
                //由于目前尚未确定以何种方式发送，所以先打出log日志。  
                Log.i("info", s.toString());
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {   // 关闭流
            try {
                reader.close();
                fis.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}      